The latest Smithsonian Institution and United States Geological Survey Weekly Volcanic Activity Report has been published by the Global Volcanism Program, covering the week 28 March to 3 April 2012. The report is compiled by Sally Kuhn Sennert. Among the highlights of this week:

Alert level at Clevelandraised as a new lava dome becomes evident

A significant increase in seismicity at Nevado del Ruiz brings a rise in the alert level

High levels of sulphur dioxide emissions at Soufrière Hills

Another paroxysmal eruptive episode at Etna with lava fountaining and ashfall

The latest Smithsonian Institution and United States Geological Survey Weekly Volcanic Activity Report has been published by the Global Volcanism Program, covering the week 14-20 March 2012. The report is compiled by Sally Kuhn Sennert. Among the highlights of this week:

A plume, probably water vapour, seen from Iliamna, where seismicity remained elevated

The latest Smithsonian Institution and United States Geological Survey Weekly Volcanic Activity Report has been published by the Global Volcanism Program, covering the week 29 February to 6 March 2012. The report is compiled by Sally Kuhn Sennert. Some of the highlights of the volcanic week:

The latest Smithsonian Institution and United States Geological Survey Weekly Volcanic Activity Report has been published by the Global Volcanism Program, covering the week 22 February to 28 February 2012. The report is compiled by Sally Kuhn Sennert. Some of the highlights:

Rincón de la Vieja: two eruptions from Rincón de la Vieja’s active crater

The Smithsonian Institution and United States Geological Survey Weekly Volcanic Activity Report, compiled by Sally Kuhn Sennert, has been issued for the week 1-7 June 2011. It’s been a lively volcanic week – highlights include:

It’s not uncommon for Popocatépetl, the volcano which overlooks the Mexican capital, Mexico City, to produce fumarolic activity and small ash emissions: Popocatépetl is an active, restless volcano. For an ash plume from Popocatépetl to reach an altitude of 3 kilometres, however, is unusual, and the event has attracted considerable interest both within Mexico and elsewhere. A small but significant eruption this morning threw out a considerable ash emission that reached 3 km into the sky and produced ashfall in some nearby districts. The fact that this volcano, with a long history of sometimes dangerous and destructive activity, is close neighbour to one of the world’s great cities means that its behaviour is very carefully watched. Mexico’s CENAPRED have said that today’s activity is still within normal parameters for Popocatépetl, but have warned people to stay at least 7 km away from the summit.

The Smithsonian Institution and United States Geological Survey Weekly Volcanic Activity Report has been issued for the week 25-31 May 2011. The report is compiled by Sally Kuhn Sennert. Notable volcanic events this week include:

Orizaba we were yet to see; but nothing could, we thought, exceed in interest the distant view of Popocatepetl from the top of our hotel in the City of Mexico, as the setting sun gilded its snowy dome, as it went down painted its snow fields with roseate hues. It is the grandest mountain summit of the valley of Anahuac. It repeats, but with emphasis, the purity of form and massiveness of Mt. Shasta, in Northern California. Its twin sister, the volcano of Iztacihuatl, or the “snowy woman,” forms a part of the same isolated range – the Cordillera of Ahualco – and was doubtless thrown up at the same time; but it has no central dome cleaving the sky, the mountain mass extending as a range running nearly north and south, with three broken irregular snow-covered summits, of which the central is the highest, reaching an altitude of 4786 meters or 15,705 feet above the sea. The height of Popocatepetl has been variously estimated. Humboldt placed it at 5400 meters, or 17,716 feet; Guyot gives its altitude as 17,784 feet; Humboldt’s measurement combined with those of two later observers, is 17,853 feet, while the French savans of the Maximilian expedition put it as high as 18,362 feet.

A. S. Packard, ‘Ascent of the Volcano of Popocatepetl’, The American Naturalist, vol. 20, no. 2 (February 1886), p. 109. For the record, the summit of Popocatépetl is 5426 metres or 17,802 feet above sea level.

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